<template>
  <div id="home">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control
        :title="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl1"
        class="tab-control"
        v-show="isTabFixed"/>
    <scroll
      class="content"
      ref="scroll"
      :probe-type="3"
      @scroll="contentScroll"
      :pull-up-load="true"
      @pullingUp="loadMore">
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"/>
      <recommend-view :recommends="recommends" />
      <feature-view />
      <tab-control
        :title="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      />
      <goods-list :goods="showGoods" />
    </scroll>

    <back-top @click.native="backClick" v-show="isShowBackTop"></back-top>
  </div>
</template>

<script>
import HomeSwiper from "./childrenComps/HomeSwiper";
import RecommendView from "./childrenComps/RecommendView";
import FeatureView from "./childrenComps/FeatureView";

import NavBar from "components/common/navbar/NavBar";
import tabControl from "components/content/tabControl/TabControl";
import GoodsList from "components/content/goods/GoodsList";
import Scroll from "components/common/scroll/Scroll";

import { getHomeMultidata, getHomeGoods } from "network/home";
import {itemListenerMixin, backTopMixin} from "common/mixin"

export default {
  name: "Home",
  components: {
    HomeSwiper,
    RecommendView,
    FeatureView,
    NavBar,
    tabControl,
    GoodsList,
    Scroll,
  },
  mixins: [itemListenerMixin, backTopMixin],
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      isTabFixed: false,
      tabOffsetTop: 0,
      saveY: 0,
    };
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    },
  },
  created() {
    //1. 请求多个数据
    this.getHomeMultidata();

    //2.请求商品数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  activated() {
    this.$refs.scroll.scrollTo(0, this.saveY, 1);
    this.$refs.scroll.refresh();
  },
  deactivated() {
    // 1.保存Y值
    this.saveY = this.$refs.scroll.getScrollY();
    
    //2.取消全局事件的监听
    this.$bus.$off('itemImageLoad', this.itemImgListener)

  },
  methods: {
    //网络请求相关
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
        // console.log(res);
      });
    },
    getHomeGoods(type) {
      let page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;

        //完成上拉加载更多
        this.$refs.scroll.finishPullUp();
      });
    },

    //事件监听相关
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    contentScroll(position) {
      //1.判断BackTop是否显示
      this.listenShowBackTop(position)
      // console.log(this.isShowBackTop);
      //2.判断tabControl是否吸顶
      this.isTabFixed = (-position.y) > this.tabOffsetTop;
      // console.log(this.isTabFixed);
    },

    loadMore() {
      this.getHomeGoods(this.currentType);
    },
    swiperImageLoad() {
      //获取tabControl 的offsetTop
    this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    // console.log(this.tabOffsetTop);
    }
  },
};
</script>

<style scoped>
#home {
  /* padding-top: 44px; */
  height: 100vh;
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
  position: relative;
  z-index: 9;
} 

.tab-control {
  position: relative;
  z-index: 9;
}

.content {
  /* height: 300px; */
  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}
/* .content {
  height: calc(100% - 93px);
  overflow: hidden;
  margin-top: 44px;
} */
</style>